The multi-connectivity technique can help in connecting multiple access network tiers to achieve enhanced coverage [1]}. However, this kind of connectivity arrangement between aerial/space, and terrestrial network tier is non-ideal, and therefore lead to a large latency which in turn will affect the information transfer. Also, the high mobility of BSs makes it difficult to get the channel state information for the connectivity management. The BSs also may generate errors in channel estimation. Another problem that can arise is the interference among the different tiers. The possible solution to tackle the interference of tiers can be done by setting a schedule system where information will be shared to upgrade user scheduling. The authors in [2]} discuss the need for high-performance algorithms for the scheduling.
